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makvit [3.9K]
3 years ago
5

Can somebody help teach me how to solve quadratic equations? I have no idea what to plug in. Here are some examples of what I ne

ed to solve (attached). Any help would be appreciated!

Mathematics
1 answer:
guapka [62]3 years ago
4 0
The best method that will work for any quadratic equation is to use the quadratic formula: x = (-b±√(b² - 4ac))/2a, this will work for any quadratic of the form ax² + bx + c = 0.

As for the last equation in the attachment, that is a cubic equation, these are much trickier to solve and as such the formula is much longer and very complicated. Therefore it is easier to see if it can be broken down into a linear term and a quadratic. This can be done by substituting integer values of x into the equation to see if it holds true. If both sides of the equation are equal for a given value of x then the equation ax³ + bx² + cx + d can be rewritten as (Ax + B)(px² + qx + r). This can then be put into the quadratic formula mentioned above.
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Which graph represents the solution set of -2y > 7x + 4?
Firdavs [7]

The equation of a line in point-slope form is expressed as:

y = mx + b

  • m is the slope of the line
  • b is the y-intercept

Given the inequality -2y > 7x + 4, this can also be expressed as:

-2y > 7x + 4

y < -7/2x -4/2

y< -7/2x - 2

This shows that the line will be a dashed line and cuts the y-axis at y= -2

Learn more on inequality graph here: brainly.com/question/11234618

4 0
2 years ago
Write an expression for cos 68° using sine
Anettt [7]

Answer:

sin22°

Step-by-step explanation:

Using the cofunction identity

cos x = sin (90 - x), then

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3 years ago
A rectangular prism with a length of 3cm, width of 4cm, and height of 5cm is packed with cubes whose side length is 1/2cm. how m
Dennis_Churaev [7]
Length = 3cm 
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Width = 4cm
1/2 cm cube = 4 ÷ 1/2 = 4 x 2 = 8

Height = 5cm
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3 years ago
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Bess [88]
3 x 7 x 12 x 2 I think
4 0
2 years ago
Read 2 more answers
Prt.3 identify the slope
andreyandreev [35.5K]

Answer:

m = - 2

Step-by-step explanation:

First coordinate : ( -2 , 9 )

Second coordinate : ( 1 , 3 )

Formulae : m=(y2-y1)/(x2-x1)

Substituting,

m = ( 3 - 9 ) / ( 1 + 2 )

m = - 6 / 3

m = - 2

If this helps you, please mark brainliest!

4 0
3 years ago
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